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A list of all the posts and pages found on the site. For you robots out there, there is an XML version available for digesting as well.
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Posts
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Blog Post number 4
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Blog Post number 1
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portfolio
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publications
GRB 220623A: NOT optical observations
Published in GRB Coordinates Network, 2022
We performed optical observations of the gamma-ray burst GRB 220623A with the Nordic Optical Telescope.
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars - II. Revised stellar masses and radii for KIC 8430105
Published in Monthly Notices of the Royal Astronomical Society, 2022
I performed a re-analysis of the eclipsing binary KIC8430105 hosting an oscillating red giant with new high precision radial velocity measurements, with a significant change in mass and radius measurements over previous analyses, as well as a large improvement in precision. We supplemented this with new spectroscopic and asteroseismic analyses, and compared the eclipsing binary measurements directly with asteroseismic scaling relations.
Spectral type and geometric albedo of (98943) 2001 CC21, the Hayabusa2# mission target
Published in Monthly Notices of the Royal Astronomical Society: Letters, 2023
Jooyeon Geem led this work to characterize the spectral type and geometric albedo of the asteroid 2001 CC21 using polarimetry. I participated in the observing effort at the Nordic Optical Telescope.
The Second International Asteroid Warning Network Timing Campaign: 2005 LW3
Published in The Planetary Science Journal, 2023
Davide Farnocchia led this study to determine the timing performance of asteroid warning networks using the asteroid 2005 LW3. I participated as the observer at the Nordic Optical Telescope.
Asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
Published in Astronomy & Astrophysics, 2023
Karsten Brogaard led this study, where we used oscillating red giants in the open cluster NGC 6866 to determine the RGB mass of the cluster and constrain convective-core overshoot, and thereby obtain a precise measure of the cluster age.
K2 results for ‘young’ alpha-rich stars in the Galaxy
Published in Astronomy & Astrophysics, 2024
Valeria Grisoni led this study, where we used precise asteroseismic ages together with detailed survey kinematics and spectroscopy to explore a flag of seemingly young (massive) stars within the old population of Milky Way disk stars. We found that their occurence rates and general properties suggest that they are products of binary mergers or mass accretion, rather than being genuinely young stars.
Connecting integrated red giant branch mass loss from asteroseismology and globular clusters
Published in Astronomy & Astrophysics, 2024
Karsten Brogaard led this work, where we used a catalogue of measurements of stellar masses obtained with asteroseismology together with survey spectroscopy (APOGEE DR17), parallaxes (Gaia DR3), and photometry (2MASS), in order to derive integrated mass loss rates of the of the Milky Way thick disk stars. This was done by comparing the masses of RGB stars (hydrogen-shell burning) to that of the more evolved core-Helium burning stars.
DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations
Published in Astronomy & Astrophysics, 2025
Alessandro Mazzi led this work, where he performed stellar population synthesis of the Kepler space mission field. We used this to derive expected asteroseismic binary fractions as a function of evolutionary stage, including the impact of binary interaction.
Advancing the accuracy in age determinations of old-disk stars using an oscillating red giant in an eclipsing binary
Published in Astronomy & Astrophysics, 2025
I led this high-precision study of the only old red giant hosting eclipsing binary with high enough asteroseismic data quality to validate the stellar mass against eclipsing binary analysis at the 1.4% level. We managed to obtain a 6% agreement on the age, and thereby affirm the use of precise asteroseismology for Galactic Archaeology.
talks
Obtaining 1% accuracy on asteroseismic Red Giant mass and radius using Eclipsing binaries
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Obtaining 1% accuracy on asteroseismic Red Giant mass and radius using Eclipsing binaries
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Detection of spectroscopic (SB2) binaries
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teaching
Teaching experience 1
Undergraduate course, University 1, Department, 2014
This is a description of a teaching experience. You can use markdown like any other post.
Teaching experience 2
Workshop, University 1, Department, 2015
This is a description of a teaching experience. You can use markdown like any other post.